Automatic nut tightening device

Abstract

The present invention relates to the field of mechanical assembly technology, and discloses an automatic nut tightening device, comprising an upper support seat, wherein the lower end of the upper support seat is connected to an L-shaped connecting seat, a first conveyor is horizontally provided inside the L-shaped connecting seat, the first conveyor is used to transport hexagonal bolts, a lifting drive seat is downwardly provided at the middle position inside the upper support seat, the lower end of the lifting drive seat is fixedly connected to a limiting shell, a nut tightening gun group is movably provided inside the limiting shell, and a rotating seat is provided inside the nut tightening gun group for downward rotation. The present invention utilizes a camshaft to drive a cam to perform circular motion, and the protrusion interacts with the contact wheel during the motion, generating an extrusion force to cause the swing arm to swing slightly downward, causing the nut sleeve to tilt slightly downward, and at the same time, the bending spring is compressed during the swinging of the swing arm, generating a vibration effect, causing the outermost group of lifting ring nuts on the nut sleeve to slide down.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical assembly, and in particular to an automatic nut tightening device. Background Art

[0002] A lifting eye nut is a fastening part, usually composed of a nut and a lifting eye welded together. It is mainly used to tightly connect mechanical equipment and is widely used in power equipment (such as in the lifting and installation of heavy equipment such as transformers and generators), port machinery (lifting cargo), steel and shipbuilding industries. The main function of the lifting eye nut is to achieve a fastening effect by cooperating with the bolt through the inner thread. Its installation method is flexible and diverse, and it has the advantages of being removable and anti-torsion. The material of the lifting eye nut is usually stainless steel, such as 304, 201, 316, etc. These materials are not only corrosion-resistant, but also have strong bearing capacity, and are particularly suitable for occasions requiring high-strength fixation. A nut tightening device is generally used when the lifting eye nut is assembled in the workshop.

[0003] The existing nut tightening device has many technical defects when in use. First, the feeding automation degree of nuts and bolts is low, and the positioning is not accurate enough, resulting in a high assembly error rate; second, the interior of the eye nut is easily contaminated with dust and debris during the production and transportation process, which can easily cause thread wear during use; third, the nut or bolt needs to be lubricated before assembly to avoid jamming during tightening. Currently, this is generally done manually by dripping oil, but this is time-consuming and labor-intensive, with low work efficiency, and on the other hand, the amount of oil dripping cannot be accurately controlled, and oil contamination is likely to occur during the transportation of the eye nut.

[0004] To sum up, considering that the existing facilities cannot meet the work requirements, we propose an automatic nut tightening device. Summary of the Invention

[0005] The main purpose of the present invention is to provide an automatic nut tightening device, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A nut automatic tightening device includes an upper support seat, the lower end of the upper support seat is connected to an L-shaped connecting seat, the interior of the L-shaped connecting seat is horizontally penetrated by a first conveyor, the interior of the first conveyor includes a conveyor belt, the conveyor belt is used to transport hexagonal bolts, a lifting drive seat is downwardly provided at the middle position inside the upper support seat, the lower end of the lifting drive seat is fixedly connected to a limiting shell, a nut tightening gun group is movably provided inside the limiting shell, a rotating seat is provided inside the nut tightening gun group for rotating downward, and the lower end of the rotating seat is riveted with a clamping outer seat.

[0008] As a preferred solution of the automatic nut tightening device described in the present invention, a clamping cylinder is vertically installed inside the rotating seat, a cylinder rod is provided inside the clamping cylinder extending toward the inside of the clamping outer seat, a trapezoidal seat is fixed to the lower end of the cylinder rod, and a first slider is symmetrically installed in the middle position of the two side surfaces of the trapezoidal seat.

[0009] As a preferred solution of the automatic nut tightening device described in the present invention, the lower end of the limiting shell is provided with a rotating motor group, the interior of the rotating motor group is provided with a rotating shaft extending downward, and the lower end of the rotating shaft is welded with an open tooling seat for positioning the hexagonal bolt, and the open tooling seat is slightly higher than the conveyor belt.

[0010] As a preferred solution of the automatic nut tightening device described in the present invention, the inner end surface of the open tooling seat is provided with a positioning plane that fits the bolt part of the hexagonal bolt, and the two inner side surfaces of the open tooling seat are symmetrically provided with receiving grooves, and the receiving grooves are used to receive angle clips, and the two groups of angle clips both act on the screw seat part of the hexagonal bolt, and the angle clips are fixed by the welding block and the horizontal end of the first hydraulic rod, and the first hydraulic rod extends horizontally outward from the inside of the No. 1 hydraulic cylinder, and the No. 1 hydraulic cylinder is located inside the open tooling seat.

[0011] As a preferred solution of the nut automatic tightening device described in the present invention, wherein: a movable seat is symmetrically and movably arranged inside the clamping outer seat and on both sides of the trapezoidal seat, the number of the movable seats is 2 groups, and an inner slot for the movement of the first slider is opened in the middle position of the inner side surface of the movable seat, and the lower end of each group of the movable seats is welded with an adjusting clamp seat through a guide block, the adjusting clamp seat extends out of the lower end surface of the clamping outer seat, and a baffle is riveted at the bottom corners of the adjusting clamp seat, and an upper curved column is provided on the upper position of the inner side surface of the two groups of adjusting clamp seats, and a first clamping groove is opened inside the upper curved column, and the first clamping groove acts on the lifting ring part of the lifting ring nut member, and a second clamping groove is opened on the lower position of the inner side surface of the adjusting clamp seat, and the second clamping groove acts on the nut part of the lifting ring nut member.

[0012] As a preferred solution of the nut automatic tightening device described in the present invention, wherein: a screw outlet is provided at the middle position of the lower end surface of the limiting shell, and two groups of sealing doors are symmetrically and movably arranged inside the screw outlet, and a second sliding block is symmetrically fixed on the side surfaces of the two groups of sealing doors, and a horizontal track acting on the second sliding block is provided on the screw outlet, and the upper end surface butting area of ​​the two groups of sealing doors is provided with a guide slope, and the bottom of the guide slope is provided with an elastic support plate acting on the lifting ring nut member, and the elastic support plate flips downward after being compressed, and a feeding gap is provided inside the sealing door and below the elastic support plate, and the upper end surface of each group of the sealing doors is provided with a first hinge groove, and the outer side surface of the nut tightening gun group is symmetrically provided with a second hinge groove, and the first hinge groove and the second hinge groove are connected by a connecting rod, and the number of the connecting rods is 2 groups.

[0013] As a preferred solution of the automatic nut tightening device described in the present invention, the front end face of the limiting shell is connected to a blanking inclined seat, the interior of the blanking inclined seat is provided with a torsion channel connected to the interior of the limiting shell, the upper end face of the torsion channel is provided with a single feed port that matches the eye nut piece, the upper end face of the blanking inclined seat is welded with a curved guide plate on one side of the single feed port, a limited circular seat is provided on the outer side of the blanking inclined seat, a limited circular groove is provided upwardly on the interior of the limiting circular seat, and a eye nut feeding platform is rotatably arranged in the limiting circular groove.

[0014] As a preferred solution of the automatic nut tightening device described in the present invention, the interior of the limiting circular groove is riveted with a sliding step that acts on the ring nut feeding platform, and a driving roller is vertically welded to the middle position of the lower end surface of the ring nut feeding platform. The position between the driving roller and the sliding step is connected by a damping bearing sleeve, and the driving roller is sleeved with a groove wheel through the end of the damping bearing sleeve. The wheel surface of the groove wheel is evenly provided with gap wheel grooves, and the number of the gap wheel grooves is preferably 4-6 groups. A first servo motor is vertically fixed downward inside the sliding step, and a crank disk is welded on the motor shaft of the first servo motor. A driving column is rotatably provided on the lower end surface of the crank disk, and the driving column extends into one group of gap wheel grooves during movement.

[0015] As a preferred solution of the automatic nut tightening device described in the present invention, the outer side surface of the eye nut feeding platform is evenly provided with a swing groove, and a swing arm is provided in the swing groove. The number of the swing groove and the swing arm is preferably 4-6 groups, and short shafts are symmetrically welded on both sides of the swing arm, and the short shafts are fixed by the first bearing seat and the groove wall of the swing groove. A contact wheel groove is provided at the lower end of the swing arm, and a contact wheel is rotatably provided in the contact wheel groove. A cam is fitted at the lower end of the contact wheel, and the cam is sleeved on the camshaft. Both ends of the camshaft are fixed by the second bearing seat and the inside of the eye nut feeding platform. One end of the camshaft extends outward and is connected to a second servo motor through a coupling. The second servo motor is fixed inside the eye nut feeding platform.

[0016] As a preferred solution of the nut automatic tightening device described in the present invention, the upper end surface of the swing arm is provided with a spring receiving sleeve, and a bending spring is installed in the spring receiving sleeve, and the upper end of the bending spring is fixed to the top of the swing groove, and the swing arm extending out of the swing groove is fixed with a nut sleeve rod, and several groups of lifting ring nut parts are sleeved on the nut sleeve rod. The bottom of the lifting drive seat is located above the unloading inclined seat and is provided with a curved material blocking groove that acts on the nut sleeve rod. A blowing channel is horizontally provided at the lower position of the inner side of the nut sleeve rod, and blowing holes connected to the blowing channel are equidistantly provided on the top of the nut sleeve rod, and the number of the blowing holes is preferably 4-8 groups, and the blowing holes act on the nut parts of the corresponding lifting ring nut parts, and the end of the blowing channel is connected with an air supply hose, each group of the air supply hoses extends inwardly and is connected to the exhaust port of the air storage tank, and an electromagnetic pulse valve is provided at the exhaust port, and the air storage tank extends upward from the inside of the lifting ring nut feeding platform.

[0017] As a preferred solution of the automatic nut tightening device described in the present invention, wherein: a No. 2 hydraulic cylinder is arranged on the horizontal left side of one group of the No. 1 hydraulic cylinder, the rear ends of the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder are connected with oil pipes, and the two groups of oil pipes are connected to the oil change seat, and a control oil pump is installed in the oil change seat, and a second hydraulic rod is movably arranged horizontally extending outward from the interior of the No. 2 hydraulic cylinder, and a wheel seat is fixed at the end of the second hydraulic rod, and a correcting wheel is rotatably arranged in the wheel seat, and a part of the correcting wheel extends out of the wheel seat to act on the screw seat part of the hexagonal bolt.

[0018] As a preferred solution of the nut automatic tightening device described in the present invention, wherein: a sealing wheel shell is fixed inside the two groups of adjusting clamps, an oil dripping wheel is fitted inside the sealing wheel shell, and a plurality of groups of oil dripping holes are evenly opened on the wheel surface of the oil dripping wheel, and the number of the oil dripping holes is preferably 10-20 groups. The middle part of the oil dripping wheel is spline-connected with a rotating rod, and the contact position between the rotating rod and the sealing wheel shell is installed with an inner bearing. One end of the rotating rod is fixed by a damping bearing and the inner wall of the adjusting clamp, and the other end of the rotating rod is sleeved with a driving wheel, and ratchets are evenly distributed on the wheel surface of the driving wheel, and a braking structure is provided at the lower end of the ratchet, and an oil dripping capillary is connected obliquely below the sealing wheel shell, and the oil dripping capillary extends out of the outer side surface of the adjusting clamp to act on the nut part of the lifting ring nut.

[0019] The cam is secured to the interior of the adjusting base and is adapted to engage the guide rails of the adjusting base and engage with the guide rails of the adjusting base so that the guide rails can be engaged with the guide rails of the adjusting base.

[0020] As a preferred solution of the automatic nut tightening device described in the present invention, the limiting round seat is fixed to the bottom of the L-shaped connecting seat through supporting legs.

[0021] As a preferred solution of the automatic nut tightening device described in the present invention, the first conveyor is not provided with side baffles in the area where the open work seat is located.

[0022] As a preferred solution of the automatic nut tightening device described in the present invention, the eye nut is screwed onto the hexagonal bolt to form a connecting piece.

[0023] As a preferred solution of the automatic nut tightening device described in the present invention, the connecting rod drives the sealing door to move linearly in the screw outlet when swinging.

[0024] As a preferred solution of the automatic nut tightening device described in the present invention, the nut tightening gun assembly includes a gun housing, a tightening gun and a torque sensor.

[0025] As a preferred solution of the automatic nut tightening device described in the present invention, an air compressor is provided on the top of the gas storage tank.

[0026] As a preferred solution of the automatic nut tightening device described in the present invention, the lower end surface of the clamping outer seat is symmetrically provided with limit openings for the movement of the guide blocks.

[0027] As a preferred solution of the automatic nut tightening device described in the present invention, the lower end of the torsion channel is located obliquely above the guide slope.

[0028] As a preferred solution of the automatic nut tightening device described in the present invention, the nut sleeve rod is normally in a slightly tilted upward state.

[0029] As a preferred solution of the automatic nut tightening device described in the present invention, the upper end of the sealing wheel housing is connected to an oil filling pipe, and the upper end of the oil filling pipe is provided with an oil storage hopper.

[0030] As a preferred solution of the automatic nut tightening device described in the present invention, an oil-proof pad is provided around the inner wall of the sealing wheel housing.

[0031] The present invention provides an automatic nut tightening device through improvement, which has the following significant improvements and advantages compared with the prior art:

[0032] Start the control oil pump to let oil flow into the oil pipe of the No. 2 hydraulic cylinder, and extend the second hydraulic rod, driving the correction wheel to contact the corner of the nut seat, slightly pushing the hexagonal bolt, and cooperating with the power of the conveyor belt to automatically adjust its position to achieve the purpose of automatic correction. At this time, start the control oil pump again to pump part of the hydraulic oil of the No. 2 hydraulic cylinder into the No. 1 hydraulic cylinder, so that the second hydraulic rod is retracted and the first hydraulic rod is extended. The two sets of angle clamps move toward each other at the same time to clamp and fix the hexagonal bolt to achieve the purpose of automatic positioning. The two sets of hydraulic cylinders form a linkage, flexible adjustment, and a high degree of automation.

[0033] The nut sleeve rod at the front end hooks the lifting ring part of the lifting ring nut piece, so that the lifting ring nut piece slides inward on the inclined nut sleeve rod, thereby achieving the purpose of automatic material collection. The second servo motor is started, and the camshaft drives the cam to perform circular motion. The protrusion interacts with the contact wheel during the movement, generating an extrusion force that causes the swing arm to swing slightly downward, causing the nut sleeve rod to tilt slightly downward. At the same time, the bending spring is compressed during the swinging of the swing arm, generating a vibration effect, causing the outermost group of lifting ring nut pieces on the nut sleeve rod to slide down and contact the curved guide plate. After being guided, it enters the torsion channel from the single feed port, thereby achieving the function of automatic unloading, with more precise unloading and a high degree of automation.

[0034] With the help of the power of the nut tightening gun group descending, the clamped eye nut first applies a force to the two sets of elastic support plates to open them downward, so that the eye nut enters the unloading gap and serves as a buffer area. Then, during the descent process, the nut tightening gun group uses the movement of the two sets of connecting rods to push the two sets of sealing doors to move linearly in the screw outlet, and slowly open the sealing doors. The linkage is high, so the purpose of automatic unloading is achieved.

[0035] The outer side surface of the nut part will extend into the second clamping groove and squeeze the brake shaft, making it return to the shaft groove, causing the intermediate platform and the top block to move inward in a straight line. The contact between the top block and the ratchet generates a force that pushes the driving wheel to rotate a certain angle around the damping bearing, thereby causing the oil dripping wheel to rotate accordingly, allowing a group of adjacent oil dripping holes to dock with the upper end position of the oil dripping capillary. The lubricating oil inside the oil dripping holes is injected into the oil dripping capillary through flow, and flows downward along the oil dripping capillary, dripping from the lower end of the oil dripping capillary to the inner wall of the nut part, thereby achieving the purpose of automatic lubrication, saving time and effort, and accurately controlling the amount of lubricating oil dripping, solving the problems of oil contamination and air drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of an automatic nut tightening device in one direction of the present invention;

[0037] Figure 2 This is a schematic diagram of the overall structure of an automatic nut tightening device according to the present invention from another direction;

[0038] Figure 3 Schematic diagram of the internal structure of the limiting housing of the present invention;

[0039] Figure 4 This is a schematic diagram of the external structure of the clamping outer seat of the present invention;

[0040] Figure 5 This is a schematic diagram of the internal structure of the clamping outer seat of the present invention;

[0041] Figure 6 Schematic diagram of the external structure of the limiting housing of the present invention;

[0042] Figure 7 Schematic diagram of the external structure of the eye nut feeding platform of the present invention;

[0043] Figure 8 This is a schematic diagram of the internal driving structure of the limiting circular seat of the present invention;

[0044] Figure 9 Schematic diagram of the external structure of the swing arm of the present invention;

[0045] Figure 10 It is a cross-sectional view of the nut sleeve rod of the present invention;

[0046] Figure 11This is a schematic diagram of the internal structure of the open tooling seat of the present invention;

[0047] Figure 12 This is a schematic diagram of the connection between the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder of the present invention;

[0048] Figure 13 Schematic diagram of the external structure of the adjusting clamping seat in the second embodiment of the present invention;

[0049] Figure 14 Schematic diagram of the internal structure of the adjusting clamping seat in the second embodiment of the present invention;

[0050] Figure 15 Schematic diagram of the specific structure of the braking structure of the present invention;

[0051] Figure 16 Schematic diagram of the internal structure of the sealing wheel housing of the present invention.

[0052] In the figure: 1. Upper support seat; 2. L-shaped connecting seat; 3. First conveyor; 4. Conveyor belt; 5. Hexagonal bolt; 6. Eye nut; 7. Connecting piece; 10. Lifting drive seat; 11. Limit housing; 12. Nut tightening gun assembly; 13. Rotating seat; 14. Clamping outer seat; 15. Clamping cylinder; 16. Cylinder rod; 17. Trapezoidal seat; 18. First slide block; 20. Moving seat; 21. Inner slot; 22. Guide block; 23. Adjusting clamp seat; 24. Limit opening; 25. Blocking piece; 26. Upper curved column; 27. First clamping slot; 28. Second clamping slot; 30. Sealing door; 31. Second slide block; 32. Guide slope; 33. Elastic support plate; 34. Feeding gap; 35. First hinge slot; 36. Second hinge slot; 37. Connecting rod;

[0053] 40. Unloading inclined seat; 41. Feeding port; 42. Curved guide plate; 43. Curved blocking groove; 44. Position-limiting circular seat; 45. Position-limiting circular groove; 46. Eye nut feeding platform; 47. Slide; 50. Drive roller; 51. Damping bearing sleeve; 52. Grooved wheel; 53. Gap wheel groove; 54. First servo motor; 55. Crank plate; 56. Drive column; 60. Air tank; 61. Swing arm; 611. Contact wheel; 612. Cam; 613. Camshaft; 614. Second bearing seat; 615. Second servo motor; 62. Stub shaft; 63. First bearing seat; 64. Nut sleeve; 65. Spring receiving sleeve; 66. Bending spring; 67. Air supply hose; 68. Air blowing channel; 69. Soot blowing hole;

[0054] 70. Rotating motor assembly; 71. Rotating shaft; 72. Opening fixture; 73. Positioning plane; 74. Hydraulic cylinder No. 1; 75. First hydraulic rod; 76. Welding block; 77. Angle clip; 781. Hydraulic cylinder No. 2; 782. Second hydraulic rod; 783. Wheel seat; 784. Correcting wheel; 785. Oil pipe; 786. Oil change seat; 787. Control oil pump;

[0055] 80. Sealing wheel housing; 81. Oil dripping wheel; 82. Oil dripping hole; 83. Rotating rod; 84. Inner bearing; 85. Damping bearing; 86. Driving wheel; 87. Ratchet; 88. Oil dripping capillary; 89. Braking structure; 891. Intermediate platform; 892. Longitudinal slide; 893. Ejector block; 894. Fixing plate; 895. Pressing plate; 896. Brake shaft; 897. Fitting surface; 898. Return spring; 899. Guide column;

[0056] 90. Support leg; 91. Outlet screw; 92. Swinging slot; 93. Storage slot; 94. Axle slot; 95. Oil filling pipe; 96. Oil storage hopper. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0058] like Figure 1-12 As shown, this embodiment provides an automatic nut tightening device, including an upper support seat 1, the lower end of the upper support seat 1 is connected to an L-shaped connecting seat 2, the L-shaped connecting seat 2 plays a role of support and positioning, the interior of the L-shaped connecting seat 2 is horizontally penetrated by a first conveyor 3, the interior of the first conveyor 3 includes a conveyor belt 4, the conveyor belt 4 moves linearly from left to right, the conveyor belt 4 is used to transport hexagonal bolts 5, the bottom of the hexagonal bolts 5 is provided with a hexagonal screw seat, and a lifting drive seat 10 is downwardly provided in the middle position of the interior of the upper support seat 1, and the lower end of the lifting drive seat 10 is fixedly connected to a limiting shell 11.

[0059] Among them, the front end face of the limiting shell 11 is connected to the blanking inclined seat 40, and the interior of the blanking inclined seat 40 is provided with a torsion channel connected to the interior of the limiting shell 11, and the shape of the torsion channel matches the ring nut member 6 (can be twisted up to 90 degrees), and the upper end face of the torsion channel is provided with a feed single port 41 that matches the ring nut member 6, and the upper end face of the blanking inclined seat 40 is welded with a curved guide plate 42 on one side of the feed single port 41 (the actual position and length of the curved guide plate 42 are determined according to the falling path of the ring nut member 6), and the ring nut member 6 can slide along the curved surface of the curved guide plate 42, as shown in FIG. Figure 1 、 2 and 6.

[0060] Furthermore, a limited position circular seat 44 is provided on the outer side of the blanking inclined seat 40, and the limited position circular seat 44 is fixed to the bottom of the L-shaped connecting seat 2 through the support legs 90. The support legs 90 play a supporting role. A limited position circular groove 45 is provided upward inside the limited position circular seat 44, and a lifting ring nut feeding platform 46 is rotatably provided in the limited position circular groove 45. Figure 1 、 2 and 7.

[0061] Specifically, the interior of the limiting circular groove 45 is riveted with a sliding step 47 that acts on the eye nut feeding platform 46. The eye nut feeding platform 46 and the sliding step 47 move relative to each other, and the sliding step 47 plays a supporting role. A driving roller 50 is vertically welded to the middle position of the lower end surface of the eye nut feeding platform 46. The position between the driving roller 50 and the sliding step 47 is connected by a damping bearing sleeve 51. The damping bearing sleeve 51 has a certain damping force. The driving roller 50 passes through the end of the damping bearing sleeve 51 and is sleeved with a groove wheel 52, as shown in FIG. Figure 7 and 8 shown.

[0062] Among them, the wheel surface of the sheave 52 is evenly provided with gap wheel grooves 53, and the interior of the slide 47 is vertically fixed downward with a first servo motor 54. A crank disk 55 is welded to the motor shaft of the first servo motor 54. A driving column 56 is rotatably provided on the lower end surface of the crank disk 55. The driving column 56 extends into one set of gap wheel grooves 53 during the movement. Figure 8 shown.

[0063] Furthermore, a swing groove 92 is evenly opened on the outer side of the eye nut feeding platform 46, and a swing arm 61 is provided in the swing groove 92. Short shafts 62 are symmetrically welded on both sides of the swing arm 61. The short shaft 62 is fixed by the first bearing seat 63 and the groove wall of the swing groove 92. Figure 7 、 9 and 10.

[0064] The lower end of the swing arm 61 is provided with a contact wheel groove, in which a contact wheel 611 is rotatably arranged, and a portion of the contact wheel 611 extends out of the contact wheel groove, and a cam 612 is fitted on the lower end of the contact wheel 611. Figure 9 and 10 shown.

[0065] In this embodiment, the cam 612 is sleeved on the camshaft 613. The two ends of the camshaft 613 are fixed by the second bearing seat 614 and the inside of the eye nut feeding platform 46. One end of the camshaft 613 extends outward and is connected to the second servo motor 615 through a coupling. The second servo motor 615 is fixed inside the eye nut feeding platform 46. Figure 9 and 10 shown.

[0066] The upper end surface of the swing arm 61 is provided with a spring receiving sleeve 65, and a bending spring 66 is installed in the spring receiving sleeve 65. The bending spring 66 has a certain vibration frequency and is used to maintain the interaction force between the contact wheel 611 and the cam 612. The upper end of the bending spring 66 is fixed to the top of the swing groove 92, as shown in FIG. Figure 9 and 10 shown.

[0067] Among them, the end of the swing arm 61 extending out of the swing slot 92 is fixed with a nut sleeve rod 64, and a plurality of sets of lifting ring nut members 6 are sleeved on the nut sleeve rod 64. Under normal circumstances, the nut sleeve rod 64 is in a slightly tilted upward state. The bottom of the lifting drive seat 10 and above the unloading inclined seat 40 are provided with a curved material blocking groove 43 acting on the nut sleeve rod 64, which plays a material blocking role. Figure 6-9 shown.

[0068] Among them, a blowing channel 68 is horizontally opened at the lower position of the interior of the nut sleeve rod 64, and soot blowing holes 69 connected to the blowing channel 68 are equidistantly opened on the top of the nut sleeve rod 64. The soot blowing holes 69 act on the nut part of the corresponding lifting ring nut 6. The end of the blowing channel 68 is connected with an air supply hose 67, and the air supply hose 67 can be displaced with the movement of the swing arm 61. Each group of air supply hoses 67 extends inwardly and is connected to the exhaust port of the air tank 60. An electromagnetic pulse valve is installed at each group of exhaust ports. The air tank 60 extends upward from the inside of the lifting ring nut feeding platform 46. An air compressor is set on the top of the air tank 60. The air compressor plays the role of compressing air, such as Figure 9 and 10 shown.

[0069] Furthermore, a nut tightening gun assembly 12 is movably provided inside the limit housing 11. The nut tightening gun assembly 12 includes a gun housing, a tightening gun and a torque sensor. A rotating seat 13 is provided inside the nut tightening gun assembly 12 for downward rotation. A clamping outer seat 14 is riveted to the lower end of the rotating seat 13. A clamping cylinder 15 is vertically installed inside the rotating seat 13. Figure 3 and 4 shown.

[0070] Specifically, a cylinder rod 16 is provided inside the clamping cylinder 15 and extends toward the inside of the clamping outer seat 14. A trapezoidal seat 17 is fixed to the lower end of the cylinder rod 16. First sliders 18 are symmetrically mounted at the middle positions of the two sides of the trapezoidal seat 17. The cross section of the first slider 18 is an inverted trapezoid and has the function of limiting sliding. Figure 5 shown.

[0071] Among them, the inner part of the clamping outer seat 14 and the movable seat 20 are symmetrically arranged on both sides of the trapezoidal seat 17. The inner groove 21 for the movement of the first slider 18 is opened in the middle position of the inner side surface of the movable seat 20. The contact surface of the two is smooth and the movement resistance is small. The lower end of each group of movable seats 20 is welded with an adjustment clamp seat 23 through a guide block 22. The lower end surface of the clamping outer seat 14 is symmetrically provided with a limit opening 24 for the movement of the guide block 22, which plays the role of limiting guide. The adjustment clamp seat 23 extends out of the lower end surface of the clamping outer seat 14, such as Figure 3-5 shown.

[0072] Among them, a baffle 25 is riveted at the bottom corner of the adjustment clamp seat 23, and the baffle 25 limits the position of the eye nut member 6 on the elastic support plate 33. The inner side surfaces of the two groups of adjustment clamp seats 23 are both provided with an upper curved column 26. The interior of the upper curved column 26 is provided with a first clamping groove 27, and the first clamping groove 27 acts on the eye portion of the eye nut member 6. The inner side surface of the adjustment clamp seat 23 is provided with a second clamping groove 28 at the lower position, and the second clamping groove 28 acts on the nut portion of the eye nut member 6. The clamping grooves at the upper and lower positions can further increase the clamping force on the eye nut member 6, such as Figure 3-5 shown.

[0073] Furthermore, a screw hole 91 is provided at the middle position of the lower end surface of the limiting shell 11, and two sets of sealing doors 30 are symmetrically arranged inside the screw hole 91. Second sliders 31 are symmetrically fixed to the sides of the two sets of sealing doors 30. A horizontal track acting on the second slider 31 is provided on the screw hole 91, and the second slider 31 moves linearly along the horizontal track. Figure 1-5 shown.

[0074] Among them, the upper end surfaces of the two sets of sealing doors 30 are both provided with a guide slope 32 in the butt area, the lower end of the torsion channel is located obliquely above the guide slope 32, and the bottom of the guide slope 32 is provided with an elastic support plate 33 acting on the eye nut 6. The elastic support plate 33 is flipped downward after being compressed and automatically resets when pressure is applied. A blanking gap 34 is provided inside the sealing door 30 and below the elastic support plate 33. In the initial stage of movement, the blanking gap 34 can serve to accommodate the eye nut 6. Figure 3 and 4 shown.

[0075] Among them, the upper end surface of each set of sealing doors 30 is provided with a first hinge groove 35, and the outer side surface of the nut tightening gun group 12 is symmetrically provided with a second hinge groove 36. The first hinge groove 35 and the second hinge groove 36 are connected by a connecting rod 37. The relative positions of the two sets of hinge grooves are designed according to actual conditions. The two ends of the connecting rod 37 are hinged. When the connecting rod 37 swings, it drives the sealing door 30 to move linearly in the screw outlet 91. Figure 3 and 4 shown.

[0076] Furthermore, a rotating motor group 70 is provided at the lower end of the limiting housing 11, and a rotating shaft 71 is provided downwardly extending from the interior of the rotating motor group 70. An open tooling seat 72 for positioning the hexagonal bolt 5 is welded to the lower end of the rotating shaft 71. The open tooling seat 72 is slightly higher than the conveyor belt 4. The first conveyor 3 is located in the area of ​​the open tooling seat 72 without a side baffle. Figure 6 shown.

[0077] Among them, the inner end surface of the open tooling seat 72 is provided with a positioning plane 73 that fits the bolt portion of the hexagonal bolt 5. Figure 11 and 12 shown.

[0078] Among them, the two inner side surfaces of the open tooling seat 72 are symmetrically provided with receiving grooves 93, which are used to receive the angle clips 77. The shape of the angle clips 77 is designed according to the screw seat structure of the hexagonal bolt 5. The two sets of angle clips 77 act on the screw seat of the hexagonal bolt 5. The angle clips 77 are fixed by the welding block 76 and the horizontal end of the first hydraulic rod 75. The first hydraulic rod 75 extends horizontally outward from the inside of the No. 1 hydraulic cylinder 74. The No. 1 hydraulic cylinder 74 is located inside the open tooling seat 72. Figure 6 、 11 and 12.

[0079] Furthermore, a second hydraulic cylinder 781 is provided on the horizontal left side of one set of the first hydraulic cylinder 74. The rear ends of the first hydraulic cylinder 74 and the second hydraulic cylinder 781 are connected to an oil pipe 785. Both sets of oil pipes 785 are connected to an oil change seat 786. A control oil pump 787 is installed in the oil change seat 786. Figure 11 and 12 shown.

[0080] Specifically, the second hydraulic cylinder 781 is provided with a second hydraulic rod 782 extending horizontally outwards, and a wheel seat 783 is fixed at the end of the second hydraulic rod 782. A correction wheel 784 is rotatably provided in the wheel seat 783. A portion of the correction wheel 784 extends out of the wheel seat 783 and acts on the screw seat of the hexagonal bolt 5 (to the left corner). Figure 11 and 12 shown.

[0081] When the present embodiment is in use, the hexagonal bolt 5 moves from left to right along with the conveyor belt 4. When it enters the open tooling seat 72, the hexagonal bolt 5 will be blocked by the positioning plane 73 and positioned. At the same time, the hexagonal bolt 5 will have a situation where the screw seat does not fit the positioning plane 73. At this time, the control oil pump 787 is started to allow the oil pipe 785 of the second hydraulic cylinder 781 to flow with oil. The second hydraulic rod 782 extends, driving the correcting wheel 784 on the wheel seat 783 to contact the edge of the screw seat, slightly pushing the hexagonal bolt 5, and cooperating with the power of the conveyor belt 4 to automatically adjust its position. This process is repeated several times until one side of the screw seat is completely in contact with the positioning plane 73. At this time, the control oil pump 787 is started again to pump part of the hydraulic oil of the No. 2 hydraulic cylinder 781 into the No. 1 hydraulic cylinder 74, so that the second hydraulic rod 782 is retracted and the first hydraulic rod 75 is extended (the first hydraulic rod 75 on the opposite side is extended by oil at the same time). The angle clip 77 extends out of the receiving groove 93 and contacts the diamond-shaped corners of the screw seat. The two sets of angle clips 77 move toward each other at the same time, clamping and fixing the hexagonal bolt 5 in the center so that it is directly below the screw outlet 91.

[0082] When this embodiment is in use, the second conveyor continues to transport the lifting ring nut parts 6. When the lifting ring nut parts 6 leave the conveyor belt 4 of the second conveyor, the lifting ring part of the lifting ring nut parts 6 is hooked by the nut sleeve rod 64 at the front end, so that the lifting ring nut parts 6 slide inward on the inclined nut sleeve rod 64 to complete the transfer of the lifting ring nut parts 6. This is carried out in sequence until the lifting ring nut parts 6 on the nut sleeve rod 64 are fully arranged. Then, the electromagnetic pulse valve on the outside of this group of nut sleeve rods 64 is opened, and part of the gas in the gas tank 60 flows into the blowing channel 68 through the gas supply hose 67, and the air flow is blown downward from several groups of dust blowing holes 69 to clean the dust and remove impurities from the inside of the nut part of the lifting ring nut parts 6.

[0083] Turn on the first servo motor 54 to drive the crank disk 55 to perform circular motion. During one circle of motion, the driving column 56 on the crank disk 55 enters one of the sets of gap wheel grooves 53. The two interact with each other, causing the groove wheel 52 to rotate a certain angle. The driving roller 50 drives the eye nut feeding platform 46 to perform intermittent motion around the limiting circular groove 45, allowing another set of empty nut sleeve rods 64 to dock with the second conveyor, and at the same time, the nut sleeve rod 64 with the eye nut part 6 on the opposite side is just located in the curved material blocking groove 43.

[0084] At this time, the second servo motor 615 on the nut sleeve rod 64 is started, the cam shaft 613 rotates, and drives the cam 612 to do circular motion. The protruding part of the cam 612 interacts with the contact wheel 611 during the movement, generating an extrusion force that causes the swing arm 61 to swing slightly downward around the two groups of first bearing seats 63, causing the nut sleeve rod 64 to tilt slightly downward (the end portion is separated from the curved material blocking groove 43). At the same time, the bending spring 66 is compressed during the swinging process of the swing arm 61, generating a vibration effect, causing the outermost group of lifting ring nut parts 6 on the nut sleeve rod 64 to slide down and off the nut sleeve rod 64. It falls (and then the restoring force of the bending spring 66 drives the nut sleeve 64 back into the curved material blocking groove 43), contacts the curved guide plate 42, and is guided by the curved guide plate 42 into the torsion channel from the feed port 41. The eye nut 6 slides down in the torsion channel while being slowly twisted (ensuring that the eye part of the eye nut 6 and the two sets of adjustment clamps 23 are parallel to each other, so as to facilitate clamping the eye part), so that the eye nut 6 moving out of the torsion channel just enters the guide slope 32, and slides from the guide slope 32 to the center position of the elastic support plate 33.

[0085] At this time, the cylinder rod 16 on the clamping cylinder 15 is retracted, driving the trapezoidal seat 17 to move linearly upward. Through the sliding force of the first slider 18 and the inner slot 21, the two groups of movable seats 20 are caused to move toward each other inside the clamping outer seat 14, so that the two groups of adjustment clamping seats 23 are close to each other, clamping the eye nut member 6 on the elastic support plate 33, so that the two groups of first clamping grooves 27 clamp the eye part of the column eye nut member 6, and at the same time, the two groups of second clamping grooves 28 clamp the nut part of the eye nut member 6.

[0086] Then the lifting device in the lifting drive seat 10 is started to drive the nut tightening gun group 12 to descend. During the descent process, the clamped lifting ring nut part 6 first applies a force to the two groups of elastic support plates 33 to open them downward, so that the lifting ring nut part 6 enters the unloading gap 34. Then, during the descent process, the nut tightening gun group 12 uses the movement of the two groups of connecting rods 37 to push the two groups of sealing doors 30 to move linearly in the screw outlet 91, and slowly open the sealing door 30, so that the lifting ring nut part 6 and the clamping outer seat 14 extend out of the screw outlet 91, and the lifting ring nut part 6 just contacts the hexagonal bolt 5 below. At this time, the tightening gun of the nut tightening gun group 12 is started to drive the clamping outer seat 14 to move spirally, and the lifting ring nut part 6 is screwed on the hexagonal bolt 5 to form a connecting part 7.

[0087] The first hydraulic rod 75 drives the angle clip 77 to return to its original position, so that the second hydraulic rod 782 drives the correction wheel 784 to extend, and limits the part of the connecting piece 7 in the opening tooling seat 72. By starting the rotating motor group 70, the rotating shaft 71 drives the opening tooling seat 72 to rotate counterclockwise by a certain angle, so that the opening of the opening tooling seat 72 is to the right, allowing the connecting piece 7 to continue to be transported to the right along the conveyor belt 4 of the first conveyor 3. Example 2

[0088] On the basis of embodiment 1, during the assembly of the eye nut 6 and the hexagonal bolt 5, due to lack of lubrication, it is easy to cause a jam during the tightening process, resulting in assembly failure. At present, the eye nut 6 is generally manually dripped with oil, but this is time-consuming and labor-intensive on the one hand, and the amount of oil dripping cannot be accurately controlled on the other hand. Oil contamination is easy to occur during the transportation of the eye nut 6. In order to solve the above technical problems, we have the following design, such as Figure 13-16 shown.

[0089] Specifically, a sealing wheel housing 80 is fixed inside the two groups of adjustment clamp seats 23, and an oil dripping capillary 88 is connected to the oblique lower part of the sealing wheel housing 80. The oil dripping capillary 88 extends out of the outer side of the adjustment clamp seat 23 and acts on the nut part of the eye nut member 6 (the lower end of the oil dripping capillary 88 is close to the inner side of the nut part, but does not touch it). An oil dripping wheel 81 is fitted inside the sealing wheel housing 80, and an oil-proof pad is provided around the inner wall of the sealing wheel housing 80 to play a role of sliding seal. A plurality of groups of oil dripping holes 82 are evenly opened on the wheel surface of the oil dripping wheel 81. The oil dripping holes 82 can only accommodate a small amount of oil droplets, such as Figure 13 、 15 and 16.

[0090] Among them, the middle part of the oil drip wheel 81 is spline-connected with a rotating rod 83, and the contact position of the rotating rod 83 and the sealing wheel shell 80 is installed with an inner bearing 84. One end of the rotating rod 83 is fixed by a damping bearing 85 and the inner wall of the adjusting clamp seat 23. The damping bearing 85 has a certain damping force to prevent it from rotating. Figure 14-16 shown.

[0091] The other end of the rotating rod 83 is sleeved with a driving wheel 86, and ratchet teeth 87 are evenly distributed on the wheel surface of the driving wheel 86. The lower end of the ratchet teeth 87 is provided with a braking structure 89. Figure 14 and 15 shown.

[0092] Specifically, the brake structure 89 includes an intermediate platform 891, a longitudinal slide 892, a top block 893, a fixing plate 894, a pressing plate 895, a brake shaft 896, a fitting surface 897, a return spring 898 and a guide column 899. Figure 14 and 15 shown.

[0093] In this embodiment, a longitudinal sliding groove 892 is opened through the interior of the middle platform 891, and a top block 893 is movably arranged in the longitudinal sliding groove 892. The top block 893 moves vertically in the longitudinal sliding groove 892, and the upper end of the top block 893 extends into the gap between the adjacent ratchet teeth 87. The lower end of the top block 893 is fitted with a clamping plate 895. The clamping plate 895 is screwed to the inside of the adjusting clamp seat 23 through the fixing plate 894. The clamping plate 895 is made of spring steel and is used to maintain the contact force between the top block 893 and the driving wheel 86.

[0094] In this embodiment, a brake shaft 896 is welded to one end of the intermediate platform 891. The brake shaft 896 extends out of the shaft groove 94. The shaft groove 94 is opened at the upper position in the second clamping groove 28. The end of the brake shaft 896 is provided with a fitting surface 897 that contacts the outer side surface of the nut part of the lifting ring nut 6. The fitting surface 897 plays a role of full fitting.

[0095] In this embodiment, a guide column 899 is welded to the other end of the intermediate platform 891, and a guide seat for inserting the guide column 899 is horizontally arranged inside the adjustment clamp 23, and a return spring 898 is fixed between the guide seat and the intermediate platform 891 and is sleeved on the outside of the guide column 899.

[0096] Furthermore, the upper end of the sealing wheel housing 80 is connected to an oil filling pipe 95, and an oil storage hopper 96 is provided at the upper end of the oil filling pipe 95. The oil filling pipe 95 can add lubricating oil to the empty oil dripping hole 82, such as Figure 15 shown.

[0097] Furthermore, an oil collecting hole is provided on the elastic support plate 33 for collecting grease dripping downwards.

[0098] When this embodiment is in use, in the process of the two sets of second clamping grooves 28 clamping the nut part of the lifting ring nut member 6, the outer side surface of the nut part will extend into the second clamping groove 28 and squeeze the brake shaft 896, causing it to retract into the shaft groove 94, causing the intermediate platform 891 and the top block 893 to move linearly inward (at the same time, the guide column 899 continues to be inserted into the guide seat, causing the return spring 898 to be compressed). The contact between the top block 893 and the ratchet 87 generates a force to push the driving wheel 86 to rotate a certain angle around the damping bearing 85, thereby causing the oil drip wheel 81 to rotate accordingly, allowing an adjacent set of oil drip holes 82 to dock with the upper end position of the oil drip capillary 88, and the lubricating oil inside the oil drip hole 82 is injected into the oil drip capillary 88 through flow, and flows downward along the oil drip capillary 88, dripping from the lower end of the oil drip capillary 88 onto the inner wall of the nut part.

[0099] When the tightening operation is completed, the eye nut 6 and the second clamping groove 28 are separated, and the brake shaft 896 loses its restraint and is reset under the elastic force of the reset spring 898 to extend out of the shaft groove 94 again. The clamping plate 895 presses against the top block 893, causing the top block 893 to slide along the back of the multiple groups of ratchet teeth 87 (the driving wheel 86 is not under force and remains stationary). As the brake shaft 896 returns to its original position, the operation is circulated to perform oiling.

[0100] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0101] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A nut automatic tightening device, comprising an upper support seat (1), characterized in that: The lower end of the upper support seat (1) is connected to an L-shaped connecting seat (2), and a first conveyor (3) is horizontally provided inside the L-shaped connecting seat (2). The first conveyor (3) includes a conveyor belt (4) inside, and the conveyor belt (4) is used to transport the hexagonal bolts (5). A lifting drive seat (10) is provided downwardly at the middle position inside the upper support seat (1), and the lower end of the lifting drive seat (10) is fixedly connected to a limit housing (11), and a nut tightening gun is movably provided inside the limit housing (11). The nut tightening gun group (12) is provided with a rotating seat (13) which is rotated downward inside. The lower end of the rotating seat (13) is riveted with a clamping outer seat (14). The interior of the rotating seat (13) is vertically installed with a clamping cylinder (15). The interior of the clamping cylinder (15) is provided with a cylinder rod (16) which extends toward the interior of the clamping outer seat (14). The lower end of the cylinder rod (16) is fixed with a trapezoidal seat (17). The middle position of the two side surfaces of the trapezoidal seat (17) is symmetrically installed with a first slider (18). A movable seat (20) is symmetrically arranged inside the clamping outer seat (14) and on both sides of the trapezoidal seat (17). An inner slot (21) for the movement of the first slider (18) is provided at the middle position of the inner side surface of the movable seat (20). An adjusting clamp seat (23) is welded to the lower end of each group of the movable seats (20) through a guide block (22). The adjusting clamp seat (23) extends out of the lower end surface of the clamping outer seat (14). A baffle (25) is riveted at the bottom corner of the adjusting clamp seat (23). An upper curved column (26) is provided at the upper position of the inner side surface of the two groups of the adjusting clamp seats (23). A first clamping groove (27) is provided inside the upper curved column (26). The first clamping groove (27) acts on the lifting ring part of the lifting ring nut member (6). A second clamping groove (28) is provided at the lower position of the inner side surface of the adjusting clamp seat (23). The second clamping groove (28) acts on the nut part of the lifting ring nut member (6). A screw outlet (91) is provided at the middle position of the lower end surface of the limiting shell (11), and two groups of sealing doors (30) are symmetrically and movably provided inside the screw outlet (91), and second sliders (31) are symmetrically fixed to the sides of the two groups of sealing doors (30), and a horizontal track acting on the second slider (31) is provided on the screw outlet (91), and the upper end surfaces of the two groups of sealing doors (30) are both provided with a guide slope (32) in the contact area, and an elastic support plate (33) acting on the lifting ring nut (6) is provided at the bottom of the guide slope (32), and the elastic support plate (33) is turned downward after being compressed, and a blanking gap (34) is provided inside the sealing door (30) and below the elastic support plate (33); The lower end of the limiting housing (11) is provided with a rotating motor group (70), and a rotating shaft (71) is provided in the interior of the rotating motor group (70) extending downward. The lower end of the rotating shaft (71) is welded with an open tooling seat (72) for positioning the hexagonal bolt (5). The open tooling seat (72) is slightly higher than the conveyor belt (4). The inner end surface of the open tooling seat (72) is provided with a positioning plane (73) that fits the bolt part of the hexagonal bolt (5). 2) are symmetrically provided with receiving grooves (93) on the two inner sides, and the receiving grooves (93) are used to receive the folded angle clips (77). Both sets of the folded angle clips (77) act on the screw seat of the hexagonal bolt (5). The folded angle clips (77) are fixed by the welding block (76) and the horizontal end of the first hydraulic rod (75). The first hydraulic rod (75) extends horizontally outward from the inside of the No. 1 hydraulic cylinder (74). The No. 1 hydraulic cylinder (74) is located inside the open tooling seat (72).

2. The automatic nut tightening device according to claim 1, characterized in that: The upper end surface of each group of the sealing doors (30) is provided with a first hinge groove (35), and the outer side surface of the nut tightening gun group (12) is symmetrically provided with a second hinge groove (36), and the first hinge groove (35) and the second hinge groove (36) are connected by a connecting rod (37).

3. The automatic nut tightening device according to claim 2, characterized in that: The front end face of the limiting shell (11) is connected to a material discharge inclined seat (40), the interior of the material discharge inclined seat (40) is provided with a torsion channel connected to the interior of the limiting shell (11), the upper end face of the torsion channel is provided with a feed port (41) that matches the eye nut (6), the upper end face of the material discharge inclined seat (40) is welded with a curved guide plate (42) on one side of the feed port (41), a limited circular seat (44) is provided on the outer side of the material discharge inclined seat (40), a limited circular groove (45) is provided upwardly on the interior of the limiting circular seat (44), and a eye nut feeding platform (46) is rotatably provided in the limiting circular groove (45).

4. The automatic nut tightening device according to claim 3, characterized in that: The interior of the limiting circular groove (45) is riveted with a sliding step (47) that acts on the eye nut feeding platform (46), and a driving roller (50) is vertically welded at the middle position of the lower end surface of the eye nut feeding platform (46). The position between the driving roller (50) and the sliding step (47) is connected by a damping bearing sleeve (51), and the driving roller (50) passes through the end of the damping bearing sleeve (51) and is sleeved with a groove wheel (52), and the wheel surface of the groove wheel (52) is evenly provided with gap wheel grooves (53). A first servo motor (54) is vertically fixed downward inside the sliding step (47), and a crank disk (55) is welded on the motor shaft of the first servo motor (54). A driving column (56) is rotatably provided on the lower end surface of the crank disk (55), and the driving column (56) extends into one of the sets of gap wheel grooves (53) during movement.

5. The automatic nut tightening device according to claim 4, characterized in that: The outer side surface of the eye nut feeding platform (46) is evenly provided with a swing groove (92), and a swing arm (61) is provided in the swing groove (92). Short shafts (62) are symmetrically welded on both sides of the swing arm (61), and the short shafts (62) are fixed by a first bearing seat (63) and the groove wall of the swing groove (92). A contact wheel groove is provided at the lower end of the swing arm (61), and a contact wheel (611) is rotatably provided in the contact wheel groove. A cam (612) is fitted on the lower end of the contact wheel (611), and the cam (612) is sleeved on the camshaft (613). Both ends of the camshaft (613) are fixed by a second bearing seat (614) and the inside of the eye nut feeding platform (46). One end of the camshaft (613) extends outward and is connected to a second servo motor (615) through a coupling. The second servo motor (615) is fixed inside the eye nut feeding platform (46).

6. The automatic nut tightening device according to claim 5, characterized in that: The upper end surface of the swing arm (61) is provided with a spring receiving sleeve (65), and a bending spring (66) is installed in the spring receiving sleeve (65). The upper end of the bending spring (66) is fixed to the top of the swing groove (92). The end of the swing arm (61) extending out of the swing groove (92) is fixed with a nut sleeve rod (64), and a plurality of groups of lifting ring nut members (6) are sleeved on the nut sleeve rod (64). The bottom of the lifting drive seat (10) is provided with a curved material blocking groove (43) acting on the nut sleeve rod (64) and located above the blanking inclined seat (40). An air blowing channel (68) is horizontally opened at the lower position of the interior of (64), and soot blowing holes (69) connected to the air blowing channel (68) are equidistantly opened on the top of the nut sleeve (64), and the soot blowing holes (69) act on the nut part of the corresponding lifting ring nut (6), and the end of the air blowing channel (68) is connected to an air supply hose (67), and each group of the air supply hose (67) extends inwardly and is connected to the exhaust port of the air storage tank (60), and an electromagnetic pulse valve is installed at the exhaust port. The air storage tank (60) extends upward from the interior of the lifting ring nut feeding platform (46).

7. The automatic nut tightening device according to claim 1, characterized in that: A second hydraulic cylinder (781) is provided on the horizontal left side of one group of the first hydraulic cylinder (74), and the rear ends of the first hydraulic cylinder (74) and the second hydraulic cylinder (781) are both connected to an oil pipe (785), and the two groups of oil pipes (785) are both connected to an oil change seat (786), and a control oil pump (787) is installed in the oil change seat (786). A second hydraulic rod (782) is provided in the second hydraulic cylinder (781) so as to extend horizontally outward, and a wheel seat (783) is fixed at the end of the second hydraulic rod (782), and a correction wheel (784) is rotatably provided in the wheel seat (783), and a part of the correction wheel (784) extends outward from the wheel seat (783) and acts on the screw seat of the hexagonal bolt (5).

8. The automatic nut tightening device according to claim 1, characterized in that: The two groups of adjusting clamp seats (23) are internally fixed with sealing wheel shells (80), and the sealing wheel shells (80) are internally fitted with oil dripping wheels (81). The wheel surface of the oil dripping wheel (81) is evenly provided with a plurality of oil dripping holes (82). The middle part of the oil dripping wheel (81) is spline-connected with a rotating rod (83). The contact position of the rotating rod (83) and the sealing wheel shell (80) is installed with an inner bearing (84). One end of the rotating rod (83) is connected to the sealing wheel shell (80) through a damping bearing ( 85) and the inner wall of the adjusting clamp seat (23), the other end of the rotating rod (83) is sleeved with a driving wheel (86), the wheel surface of the driving wheel (86) is evenly distributed with ratchets (87), the lower end of the ratchets (87) is provided with a braking structure (89), and the lower part of the sealing wheel housing (80) is connected with an oil dripping capillary (88), and the oil dripping capillary (88) extends out of the outer side surface of the adjusting clamp seat (23) and acts on the nut part of the lifting ring nut (6).

9. The automatic nut tightening device according to claim 8, characterized in that: The braking structure (89) includes an intermediate platform (891), a longitudinal slide groove (892), a top block (893), a fixing plate (894), a pressing plate (895), a brake shaft (896), a fitting surface (897), a return spring (898) and a guide column (899). The intermediate platform (891) is provided with a longitudinal slide groove (892) running through the interior thereof. A top block (893) is movably provided in the longitudinal slide groove (892). The upper end of the top block (893) extends into the gap between adjacent ratchet teeth (87). The lower end of the top block (893) is fitted with a pressing plate (895). The pressing plate (895) is screwed to the adjusting clamp seat (894) through the fixing plate (894). 23), a brake shaft (896) is welded to one end of the intermediate platform (891), the brake shaft (896) extends out of the shaft groove (94), the shaft groove (94) is opened in the upper position of the second clamping groove (28), the end of the brake shaft (896) is provided with a fitting surface (897) that contacts the outer side surface of the nut part of the lifting ring nut (6), the other end of the intermediate platform (891) is welded to a guide column (899), the interior of the adjusting clamp (23) is horizontally provided with a guide seat for inserting the guide column (899), and a return spring (898) that is sleeved on the outer side of the guide column (899) is fixed between the guide seat and the intermediate platform (891).

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